D800 - why quicktime?

I was just messing around with a video file from a D800. The video track (H.264) can obviously be put into an mp4 container losslessly, but the audio track appears to be some weird mac codec called "sowt" according to G-Spot. The latest FFmpeg refuses to deal with it. What is this?

(Honestly, I'm a bit puzzled such a high-end camera uses something this obscure.)